[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [Type](https://evolu.dev/docs/api-reference/common/Type) › regex

```ts
const regex: <Name>(
  name: Name,
  pattern: RegExp,
) => BrandFactory<Name, string, RegexError<Name>>;
```

Defined in: [packages/common/src/Type.ts:1497](https://github.com/evoluhq/evolu/blob/e7144e2bbe9069362b62dec1b64a8aa922b8f1b0/packages/common/src/Type.ts#L1497)

String matching a regular expression.

### Example

```ts
const Alphanumeric = regex("Alphanumeric", /^[a-z0-9]+$/i)(String);
```